Switching power supply

Abstract

A high-speed switching power supply. The high-speed switching power supply includes a primary power supply. A plurality of switching elements are connected to the primary power supply. A plurality of coils is connected to the plurality of switching elements. A capacitor is connected to the plurality of coils. A sum of currents flowing through the plurality of coils is made constant by a means for setting or selecting a power supply voltage depending on the number of coils.

What is claimed is: 
     
         1 . A high-speed switching power supply comprising:
 a primary power supply;   a plurality of switching elements connected to the primary power supply;   a plurality of coils connected to the plurality of switching elements; and   a capacitor connected to the plurality of coils;   wherein a sum of currents flowing through the plurality of coils is made constant by a means for setting or selecting a power supply voltage depending on the number of coils.   
     
     
         2 . The high-speed switching power supply according to  claim 1 , wherein N coils are provided, currents flowing through the N coils have the same waveform, phases of the currents are shifted by 2π/N, and the power supply voltage is set or selected as output voltage×(1+(number of coils in which currents have decreased)/(number of coils in which currents have increased)). 
     
     
         3 . The high-speed switching power supply according to  claim 2 , wherein the number of coils in which currents have increased is two or more. 
     
     
         4 . The high-speed switching power supply according to  claim 2 , wherein the number of coils in which currents have increased is greater than the number of coils in which currents have decreased. 
     
     
         5 . The high-speed switching power supply according to  claim 1 , wherein the sum of the currents flowing through the plurality of coils is controlled to be a target value by a means for controlling the plurality of switching elements. 
     
     
         6 . The high-speed switching power supply according to  claim 1 , wherein the sum of the currents flowing through the plurality of coils is controlled to be a target value by a means for changing the power supply voltage. 
     
     
         7 . The high-speed switching power supply according to  claim 1 , wherein startup is accelerated by the means for changing the power supply voltage. 
     
     
         8 . The high-speed switching power supply according to  claim 1 , wherein the sum of the currents flowing through the plurality of coils is controlled to be a target value by a means for changing a value of a resistance inserted into or connected to the plurality of switching elements. 
     
     
         9 . The high-speed switching power supply according to  claim 1 , wherein falling is accelerated by the means for changing a value of a resistance inserted into or connected to the plurality of switching elements. 
     
     
         10 . The high-speed switching power supply according to  claim 1 , wherein a resonance frequency determined by the coils and the capacitor is 0.1 times or more a switching frequency. 
     
     
         11 . The high-speed switching power supply according to  claim 1 , wherein the number of phases of the coils is increased or decreased during rising or according to an output current. 
     
     
         12 . The high-speed switching power supply according to  claim 1 , wherein a clock cycle is changed according to the output current. 
     
     
         13 . The high-speed switching power supply according to  claim 1 , wherein current values flowing through the plurality of coils are aligned. 
     
     
         14 . The high-speed switching power supply according to  claim 1 , wherein phase compensation is realized by digital control. 
     
     
         15 . The high-speed switching power supply according to  claim 14 , wherein the phase compensation eliminates an oscillation element. 
     
     
         16 . A laser device for driving a laser by the high-speed switching power supply according to  claim 1 .